Group size estimator

How many trainers do I need to invite?

The Estimator is already "trainers of this attacker needed to finish inside the timer", so this page does not invent a number: it reads it off the boss's own ranked counter list for three realistic parties and re-simulates each of them at every level from 20 to 50.

Raid bossTierIVsWeatherFriendshipDodgingShadow attackersMega attackersLegendary attackers

Invite 3 to be safe — 3 if everyone is prepared

At level 40, a party of Shuckle's top six counters needs 2.31 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.99 (round up: 3). The raid timer is 180 seconds and one prepared trainer alone would take 6:46. No level in this range makes it soloable with a prepared party.

Shuckle · Shadow Tier 3

bugrock

Weak to

rocksteelwater

Boss CP: 4,102
Boss HP: 4,000
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Shuckle at each attacker level
Attacker level	Six of the best counter	A prepared party	A mixed local group	Prepared solo time	Faints per timer
Level 20	3(2.79)	4(3.22)	5(4.11)	9:26	0.8
Level 25	3(2.55)	3(2.80)	4(3.79)	8:11	0.5
Level 30	3(2.34)	3(2.61)	4(3.23)	7:38	0.3
Level 35	3(2.28)	3(2.55)	4(3.06)	7:28	0.3
Level 40	2(1.91)	3(2.31)	3(2.99)	6:46	0.3
Level 45	2(1.87)	3(2.27)	3(2.93)	6:38	0.2
Level 50	2(1.82)	3(2.20)	3(2.85)	6:26	0.1

Whole trainers in bold, the raw estimator in brackets — 2.04 means two trainers is right on the line and three is comfortable.

Six of the best counter

Every trainer brings six copies of the single best counter — the theoretical floor.

2 trainers at level 40

Necrozma (Dusk Mane)1.91

A prepared party

Each trainer brings the boss's top six counters, powered up and correctly TM'd.

3 trainers at level 40

Necrozma (Dusk Mane)1.91
Zamazenta (Crowned Shield)1.94
Zacian (Crowned Sword)2.00
Necrozma (Dawn Wings)2.52
Kyogre2.73
Dialga (Origin)2.77

A mixed local group

Ranks 13-24: reasonable but unoptimised parties, which is what a public lobby usually is.

3 trainers at level 40

Lucario2.91
Kyurem (White)2.96
Glimmora2.97
Kingler2.96
Tinkaton2.96
Duraludon3.00

The party these numbers assume

1. Necrozma (Dusk Mane)

Psycho Cut + Sunsteel Strike

2. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

3. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

4. Necrozma (Dawn Wings)

Metal Claw + Moongeist Beam

5. Kyogre

Waterfall + Origin Pulse

6. Dialga (Origin)

Metal Claw + Roar of Time

See the full ranked counter list for Shuckle · check a real lobby (win chance, who brings what) · make a share card of the top six

How this is worked out

The boss is ranked once at level 40 with rankCached (the same memoised call /raids makes), then the three bands — rank 1, ranks 1-6, ranks 13-24 — are re-simulated at each attacker level with an 8-run Monte Carlo each. Holding the party fixed and moving only its level is deliberate: it answers "what if my party were level 20" rather than "what would a level-20 player's completely different party be", and it is about ten times cheaper than re-ranking every attacker seven times. The Estimator itself is Pokebattler's definition, time to win including rejoin time divided by the raid timer.